BOUDICCAfAncient Celtic (Latinized)Derived from Brythonic boud meaning "victory". This was the name of a 1st-century queen of the Iceni who led the Britons in revolt against the Romans. Eventually her forces were defeated and she committed suicide. Her name is first recorded in Roman histories, as Boudicca by Tacitus and Βουδουικα (Boudouika) by Cassius Dio.

BRENNUSmAncient Celtic (Latinized)Latinized form of a Celtic name (or title) that possibly meant either "king, prince" or "raven". Brennus was a Gallic leader of the 4th century BC who attacked and sacked Rome.

BRIANmEnglish, Irish, Ancient IrishThe meaning of this name is not known for certain but it is possibly related to the old Celtic element bre meaning "hill", or by extension "high, noble". It was borne by the semi-legendary Irish king Brian Boru, who thwarted Viking attempts to conquer Ireland in the 11th century. He was slain in the Battle of Clontarf, though his forces were decisively victorious. The name was common in Ireland before his time, and even more so afterwards. It came into use in England in the Middle Ages, introduced by Breton settlers. It subsequently became rare, but was revived in the 20th century.

CUNOBELINUSmAncient CelticPossibly means "hound of Belenus" from the old Celtic element koun "hound" combined with the name of the god BELENUS. This was the name of a 1st-century king of southeast Britain.

DRUSTmAncient CelticPictish name probably derived from Celtic drest meaning "riot" or "tumult". This name was borne by several kings of the Picts, including their last king Drust X, who ruled in the 9th century.

GWRTHEYRNmAncient CelticMeans "supreme king" from Welsh gor meaning "over" and teyrn meaning "king, monarch". It is possible that this is not a name, but a title. Gwrtheyrn (also known as Vortigern) was a 5th-century king of the Britons. It was he who invited Horsa and Hengist to Britain, which eventually led to the Anglo-Saxon conquest of England.

LÓEGAIREmIrish Mythology, Ancient IrishMeans "calf herder", derived from Irish loagh "calf". In Irish mythology Lóegaire Búadach was an Ulster warrior. He saved the life of the poet Áed, but died in the process. This was also the name of several Irish high kings.

MÁEL SECHNAILLmAncient IrishMeans "disciple of Saint SEACHNALL" in Irish. This was the name of two Irish high kings: Máel Sechnaill mac Máele Ruanaid who ruled all of Ireland in the 9th century; and Máel Sechnaill mac Domnaill (called Malachy) who defeated the Norse of Dublin in the 10th century.

NECHTANmIrish Mythology, Ancient CelticCeltic name of uncertain meaning, possibly meaning "damp" (cognate with NEPTUNE). In Irish mythology Nechtan was the husband of Boand, the goddess of the River Boyne. This name was also borne by the 5th-century Saint Nectan of Hartland in Devon, who was supposedly born in Ireland. It was also the name of several kings of the Picts.

NINIANmScottish, Irish, Ancient CelticMeaning unknown. It appears in a Latinized form Niniavus, which could be from the Welsh name NYNNIAW. This was the name of a 5th-century British saint who was apparently responsible for many miracles and cures. He is known as the Apostle to the Picts.

NYNNIAWmAncient CelticMeaning unknown, presumably of Welsh origin. According to the 12th-century chronicler Geoffrey of Monmouth, this was the name of a Welsh prince who fought against the invading forces of Julius Caesar. It was also borne by an 8th-century Welsh historian, usually known by the Latinized form Nennius.

VERCINGETORIXmAncient CelticMeans "king over warriors" from Gaulish ver "on, over" combined with cingeto "marching men, warriors" and rix "king". This name was borne by a chieftain of the Gaulish tribe the Arverni. He led the resistance against Julius Caesar's attempts to conquer Gaul, but he was eventually defeated, brought to Rome, and executed.